Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149344
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =42a(5) =144a(6) =558a(7) =2115a(8) =8365a(9) =32835a(10) =134882a(11) =549528a(12) =2286600a(13) =9483263a(14) =40231902a(15) =170084068a(16) =727936899a(17) =3111265619a(18) =13473412479a(19) =58262030565a(20) =253926141635
External references
- oeis: A149344